ATERIDO A, CAÑETE JD, TORNERO J, et al. Genetic variation at the glycosaminoglycan metabolism pathway contributes to the risk of psoriatic arthritis but not psoriasis. Ann Rheum Dis. 2018 Dec 14. pii: annrheumdis-2018-214158. doi: 10.1136/annrheumdis-2018-214158.